Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz - Page 36 - diyAudio
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Old 3rd September 2014, 08:22 PM   #351
borges is offline borges  Norway
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The diagram is from a Japanese app note on the PCM1704. It has been posted on diyaudio before.

See Urgen question about de-coupling capacitor for PCM1704

I'm currently running some tests on PCM1704 absolute linearity and harmonic distortions.

Børge
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Old 4th September 2014, 01:56 PM   #352
Shinja is offline Shinja  Japan
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There is no such description on japanese datasheets of pcm63,1702,1704 or ANJ1082,ANJ1092! I did not know that.
Thanks Andrea, Søren.

So... I think each nodes of R-2R is feeded from two current sources. One is lower DAC's, another one is upper DAC's.
It matchs the diagram Søren posted, isnt it?

I have some articles copied from japanese audio magazine and there is die photographs of PCM63 and PCM1704.
I will scan and post them later, though they are not good quality copy.
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Old 7th September 2014, 04:53 AM   #353
Shinja is offline Shinja  Japan
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these are them.
Although there are numbers 1-5 on the PCM63P's picture(left) ,no captions in the article at all.
Attached Images
File Type: jpg pcm002.jpg (570.9 KB, 1677 views)
File Type: jpg pcm003.jpg (519.0 KB, 1495 views)
File Type: jpg pcm004.jpg (392.7 KB, 1471 views)
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Old 7th September 2014, 08:33 AM   #354
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1702, 1704,63 seems to be the same structure.
Attached Images
File Type: png Screenshot from 2014-09-07 16:24:54.png (42.2 KB, 1505 views)
File Type: png Screenshot from 2014-09-07 16:26:10.png (51.7 KB, 1301 views)
File Type: png Screenshot from 2014-09-07 16:26:42.png (32.2 KB, 230 views)
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Old 8th September 2014, 09:38 AM   #355
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borges has right http://www.tij.co.jp/jp/lit/an/jaja006/jaja006.pdf
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Old 9th September 2014, 10:38 PM   #356
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Attached is an AES paper titled "20bit Colinear Dac - A solution to low level problems" which discusses the PCM63 architecture. Given the structure is similar to the PCM1704 the information might be of interest.

I've had to split the file to get around the forum size limit.
Attached Files
File Type: pdf 3046-a.pdf (599.6 KB, 189 views)
File Type: pdf 3046-b.pdf (671.1 KB, 102 views)
File Type: pdf 3046-c.pdf (409.2 KB, 93 views)
File Type: pdf 3046-d.pdf (583.4 KB, 97 views)
File Type: pdf 3046-e.pdf (733.5 KB, 99 views)

Last edited by spzzzzkt; 9th September 2014 at 10:44 PM.
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Old 11th September 2014, 10:47 AM   #357
Shinja is offline Shinja  Japan
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Thank you spzzzzkt.
very interesting paper.
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Old 19th September 2014, 09:04 AM   #358
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Any news about when the DAC will be available ?


Best regards
Arthur.
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Old 19th September 2014, 09:09 AM   #359
PH is offline PH  Slovenia
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I can't wait either!
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Old 25th September 2014, 07:39 PM   #360
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me too...
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